IIAP Publications: Recent submissions

  • Internal kinematics of open star clusters 
    Sagar, R; Bhatt, H. C (Royal Astronomical Society, 1989-02)
    Proper motion measurements are employed to investigate the internal kinematics of eight open star clusters. In most of the clusters considered, no dependence of the intrinsic dispersion in proper motion on stellar mass and ...
  • Dust envelopes around RV Tauri stars 
    Raveendran, A. V (The Royal Astronomical Society, 1989-06)
    In the IRAS (12)-(25), (25)-(60) color-color diagram, RV Tauri stars are found to populate cooler temperature regions, distinctly different from those occupied by the oxygen and carbon Miras. The IRAS fluxes are consistent ...
  • Is LR SCO and RCB star? 
    Giridhar, S; Kameswara Rao, N; Lambert, D. L (The Observatory, 1990-08)
  • Capture of field stars by molecular clouds 
    Bhatt, H. C (European Southern Observatory, 1989-04)
    Field stars can be captured by massive interstellar clouds. Stars encounter interstellar clouds with relative velocities that have a distribution. Close encounters in which stars enter a cloud with relative velocities less ...
  • Polarimetric observations of comet P/Halley on 19 March 1986 
    Sen, A. K; Joshi, U. C; Deshpande, M. R; Babu, G. S. D; Kulshrestha, A. K (European Southern Observatory, 1988-10)
    Optical linear polarization data are presented for the coma and tail region of comet P/Halley observed on 19 March 1986. Polarization in the continuum has been found to increase with wavelength while the position angle ...
  • Probability of arrival of rays of light for propagation through random media: Connection with rotational brownian motion 
    Chatterjee, S (Elsevier, 1989-12)
    An expression is derived for the probability of arrival of rays of light for propagation through a random medium with isotropic and homogeneous correlation function for the refractive index fluctuations. This expression ...
  • Rahu in the Burmese Tradition 
    Kochhar, R. K (Royal Astronomical Society, 1990-06)
  • JHK photometric study of the variable interstellar extinction in the direction of open star cluster NGC 654 
    Sagar, R; Yu, Q. Z (The Royal Astronomical Society, 1989-10)
    JHK magnitudes have been determined for 18 stars in the field of NGC 654. Study of the interstellar extinction law in the cluster direction indicates an anomalous distribution of interstellar grains causing more extinction ...
  • The R Coronae Borealis stars: carbon abundances from forbidden carbon lines 
    Pandey, G; Lambert, D. L; Kameswara Rao, N; Gustafsson, B; Ryde, N; Yong, D (Royal Astronomical Society, 2004-09)
    Spectra of several R Coronae Borealis (RCB) stars at maximum light have been examined for the [CI] 9850- and 8727-Åabsorption lines. The 9850-Åline is variously blended with an FeII and CN lines, but positive identifications ...
  • Effects of stimulated emission on radiative transfer with partial redistribution 
    Rangarajan, K. E; Mohan Rao, D; Peraiah, A (The European Southern Observatory, 1990-08)
    The non-LTE line transfer with stimulated emission is studied. Stimulated emission is important for red transitions in hot stars and infrared transitions in cool stars. The deviation of the absorption and emission profiles ...
  • The Gauribidanur radio observatory 
    Sastry, Ch. V (National Institute of Science Communication and Information Resources, 1989-08)
    The Raman Research Institute and the Indian Institute of Astrophysics in a joint collaboration program operate the Gauribidanur radio observatory. Details of the various antenna arrays and receiver systems available at the ...
  • Optical telescopes in India 
    Bhattacharyya, J. C (National Institute of Science Communication and Information Resources, 1989-08)
    Fabrication and use of optical telescopes for astronomical observations in India have been reviewed. Evolution of telescopes, their optics, mounting and drive system leading to large aperture instruments of today has been ...
  • Near-infrared photometric study of open star cluster IC 1805 
    Sagar, R; Yu, Q. Z (American Astronomical Society, 1990-04)
    The JHK magnitudes of 29 stars in the region of open star cluster IC 1805 were measured. These, and the existing infrared and optical observations, indicate a normal interstellar extinction law in the direction of the ...
  • Loss of magnetic tension in pre-flare magnetic configurations 
    Venkatakrishnan, P (Kluwer Academic Publishers, 1990-08)
    We demonstrate that magnetic tension vanishes at regions of large magnetic shear on the polarity inversion line. The characteristics of these tension-free fields depend on the density of the medium and, therefore, change ...
  • Study of young open clusters as tracers of spiral features in our Galaxy. IV - Czernik 20 (OC1 427) 
    Babu, G. S. D (Indian Academy of Sciences, 1989-09)
    Photoelectric and photographic photometry of 72 stars was done in the field of the not-well-studied open cluster Czernik 20 in the direction of the Auriga constellation. Of these stars, a total of 43 have been found to be ...
  • Coherent Plasma Processes and the Continuum Emission in Active Galactic Nuclei 
    Krishan, V; Wiita, P. J (Royal Astronomical Society, 1990-10)
    Stimulated Raman scattering processes appear to be able to produce the typical electromagnetic continuum of an active galactic nucleus (AGN). Seed photons beat through Raman forward-scattering to create Langmuir plasma ...
  • Optical spectrum of supernova 1989 B in NGC 3627 
    Prabhu, T. P; Krishnamurthi, A (The European Southern Observatory, 1990-06)
    Spectra of SN 1989 B in NGC 3627 were recorded photographically on three nights near maximum and two nights near seven weeks from maximum. The spectrum and its evolution bears a close resemblance to a typical type Ia ...
  • Kinematic studies of five galactic planetary nebulae 
    Banerjee, D. P. K; Anandarao, B. G; Jain, S. K; Mallik, D. C. V (The European Southern Observatory, 1990-12)
    High-resolution Fabry-Perot observations have been made to determine the velocity structure of five PNe and to subsequently relate the observations to the morphology of the objects. New kinematic data on one of these PNe, ...
  • The far-infrared (IRAS) excess in BQ() and related stars 
    Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1989-11)
    The FIR IRAS flux distributions and color of 12 peculiar emission-line objects (HD 51585, Hen 401, Hen 591, Hen 1013, He 2-138, M 2-9, HD 326971, Hen 1357, Hen 1428, Tc 1, Hen 1475, and M 1-26) are found to be similar to ...
  • Existence of Nanoparticle Dust Grains in the Inner Solar Corona? 
    Singh, J; Sakurai, T; Ichimoto, K; Hagino, M; Yamamoto, T. T (The American Astronomical Society, 2004-06)
    Motivated by the recent paper by Habbal et al., we have made spectroscopic observations in the wavelength range of 1072.8-1079.0 nm of the solar corona above the coronal hole region on several days using a coronagraph. We ...

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